Now we know how Kate Walsh maintains her fabulous figure at the age of 45!

The Private Practice star hit the hiking trail in Hollywood with her dog for an intense afternoon workout.

Walsh didn't even stay on the trails! At times, the red-headed beauty climbed up and down some intense hills.

Kate has been dating writer Chris Case since the summer of 2011. Too bad he didn't get a chance to join his main squeeze on the hike.

As for her long-running ABC show, the final three episodes of Private Practice will air early next year.

Grey's Anatomy hottie Kate Walsh is back on the market ... in terms of real estate anyway!

Walsh has put her Spanish-style Los Angeles mansion for sale again at $3.995 million -- she paid $4.75 million for the 5,940-square-foot house in 2007.

The four-bedroom, four-and-a-half bathroom home was built in 1928. Walsh first put it on the market in May 2010, then took it off five months later.

Features include gorgeous stand-alone tubs, walk-in closets, pool, guest house, gym and more.

Kate Walsh has a new and fragrant significant other ... and with this one, she doesn't have to wonder if he'll call the next day. The Private Practice star has announced the release of her first fragrance, Boyfriend.

43-year-old Walsh says the following about her new scent:

"You ever miss the scent of your boyfriend on your skin? Well, I did. So I created BOYFRIEND, a fragrance inspired by him but made for us. It’s got all the floral notes that we ladies love and that warm, woody, amber musk that makes you purr like a jungle cat. Now you can take your Boyfriend with you wherever you go."

Kate, who is currently on the cover of Women's Wear Daily, tweeted about her smelly creation:

I’m super excited about this! Other than being a tv doctor, I’ve been bustin’ my ass for my Boyfriend for the last couple of years and can’t wait for u to smell Him!"

Boyfriend, which will be sold through HSN, has been described as a bright muguet floralcy with dark plum and myrrh on top, with night blooming jasmine.

Guess no one can now say her career choices stink.

Kate Walsh attended the men's singles semifinal match between Rafael Nadal of Spain and Mikhail Youzhny of Russia at the 2010 U.S. Open in New York, and all we have to say is, who knew the Private Practice starlet got so pumped about tennis?

Then again, Charlize Theron got pretty into it as well:

Wonder which one they were cheering for?

We're not sure where Kate Walsh has been hiding these days, but the 42-year-old star looked positively radiant when we snapped her leaving the Andy LeCompte salon in Beverly Hills yesterday!

Kate's ABC show Private Practice still seems to be going strong, but we have a feeling the upcoming fourth season may be the last...

We caught Private Practice star Kate Walsh and her bf Neil Andrea running errands in Brentwood yesterday, it looks like she's moved on from her divorce and found happiness with her new guy. So who is this Neil dude? According to IMDb, he's handled underwater stunts and dives on some major motion pictures, including two of the films in the Pirates Of The Caribbean franchise. How exciting!

Kate Walsh was spotted grocery shopping in Hollywood over the weekend, and while the Grey's Anatomy Private Practice star doesn't always wear the cutest clothes (this top is kinda blah), I love her anyway. Maybe it's because Addison was my fav character on Grey's, or because Kate's hair color is the stuff Loreal chemists dream of, but I can't get enough of this TV doc!

Kate Walsh (who is looking 1000% better than the last time we saw her) was just one of the lovely ladies who came out for the Global Green pre-Oscar party last night at the Avalon in Hollywood.

Who else showed up to the event? Check out the gallery below and see for yourself!